PeerStreamer

/*

 * AAC encoder wrapper

 * Copyright (c) 2010 Martin Storsjo

 *

 * This file is part of Libav.

 *

 * Libav is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * Libav is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with Libav; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include <vo-aacenc/voAAC.h>

#include <vo-aacenc/cmnMemory.h>

#include "avcodec.h"

#include "mpeg4audio.h"

typedef struct AACContext {

    VO_AUDIO_CODECAPI codec_api;

    VO_HANDLE handle;

    VO_MEM_OPERATOR mem_operator;

    VO_CODEC_INIT_USERDATA user_data;

} AACContext;

static av_cold int aac_encode_init(AVCodecContext *avctx)

{

    AACContext *s = avctx->priv_data;

    AACENC_PARAM params = { 0 };

    int index;

    avctx->coded_frame = avcodec_alloc_frame();

    avctx->frame_size = 1024;

    voGetAACEncAPI(&s->codec_api);

    s->mem_operator.Alloc = cmnMemAlloc;

    s->mem_operator.Copy = cmnMemCopy;

    s->mem_operator.Free = cmnMemFree;

    s->mem_operator.Set = cmnMemSet;

    s->mem_operator.Check = cmnMemCheck;

    s->user_data.memflag = VO_IMF_USERMEMOPERATOR;

    s->user_data.memData = &s->mem_operator;

    s->codec_api.Init(&s->handle, VO_AUDIO_CodingAAC, &s->user_data);

    params.sampleRate = avctx->sample_rate;

    params.bitRate    = avctx->bit_rate;

    params.nChannels  = avctx->channels;

    params.adtsUsed   = !(avctx->flags & CODEC_FLAG_GLOBAL_HEADER);

    if (s->codec_api.SetParam(s->handle, VO_PID_AAC_ENCPARAM, &params)

        != VO_ERR_NONE) {

        av_log(avctx, AV_LOG_ERROR, "Unable to set encoding parameters\n");

        return AVERROR_UNKNOWN;

    }

    avctx->extradata_size = 2;

    avctx->extradata      = av_mallocz(avctx->extradata_size +

                                       FF_INPUT_BUFFER_PADDING_SIZE);

    if (!avctx->extradata)

        return AVERROR(ENOMEM);

    for (index = 0; index < 16; index++)

        if (avctx->sample_rate == ff_mpeg4audio_sample_rates[index])

            break;

    if (index == 16) {

        av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate %d\n",

                                    avctx->sample_rate);

        return AVERROR_NOTSUPP;

    }

    avctx->extradata[0] = 0x02 << 3 | index >> 1;

    avctx->extradata[1] = (index & 0x01) << 7 | avctx->channels << 3;

    return 0;

}

static int aac_encode_close(AVCodecContext *avctx)

{

    AACContext *s = avctx->priv_data;

    s->codec_api.Uninit(s->handle);

    av_freep(&avctx->coded_frame);

    return 0;

}

static int aac_encode_frame(AVCodecContext *avctx,

                            unsigned char *frame/*out*/,

                            int buf_size, void *data/*in*/)

{

    AACContext *s = avctx->priv_data;

    VO_CODECBUFFER input = { 0 }, output = { 0 };

    VO_AUDIO_OUTPUTINFO output_info = { { 0 } };

    input.Buffer = data;

    input.Length = 2 * avctx->channels * avctx->frame_size;

    output.Buffer = frame;

    output.Length = buf_size;

    s->codec_api.SetInputData(s->handle, &input);

    if (s->codec_api.GetOutputData(s->handle, &output, &output_info)

        != VO_ERR_NONE) {

        av_log(avctx, AV_LOG_ERROR, "Unable to encode frame\n");

        return AVERROR_UNKNOWN;

    }

    return output.Length;

}

AVCodec ff_libvo_aacenc_encoder = {

    "libvo_aacenc",

    CODEC_TYPE_AUDIO,

    CODEC_ID_AAC,

    sizeof(AACContext),

    aac_encode_init,

    aac_encode_frame,

    aac_encode_close,

    NULL,

    .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},

    .long_name = NULL_IF_CONFIG_SMALL("VisualOn libvo-aacenc AAC"),

};